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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 * 
 *    Copyright (c) [2017-2021] Payara Foundation and/or its affiliates. All rights reserved.
 * 
 *     The contents of this file are subject to the terms of either the GNU
 *     General Public License Version 2 only ("GPL") or the Common Development
 *     and Distribution License("CDDL") (collectively, the "License").  You
 *     may not use this file except in compliance with the License.  You can
 *     obtain a copy of the License at
 *     https://github.com/payara/Payara/blob/main/LICENSE.txt
 *     See the License for the specific
 *     language governing permissions and limitations under the License.
 * 
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 *     file and include the License file at legal/OPEN-SOURCE-LICENSE.txt.
 * 
 *     GPL Classpath Exception:
 *     The Payara Foundation designates this particular file as subject to the "Classpath"
 *     exception as provided by the Payara Foundation in the GPL Version 2 section of the License
 *     file that accompanied this code.
 * 
 *     Modifications:
 *     If applicable, add the following below the License Header, with the fields
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package fish.payara.microprofile.healthcheck.servlet;

import fish.payara.microprofile.healthcheck.HealthCheckService;
import fish.payara.microprofile.healthcheck.HealthCheckType;
import java.io.IOException;
import jakarta.servlet.ServletException;
import jakarta.servlet.http.HttpServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import static jakarta.servlet.http.HttpServletResponse.SC_FORBIDDEN;
import org.glassfish.internal.api.Globals;

/**
 * Servlet that kicks off the HealthChecks when hit.
 * @author Andrew Pielage
 */
public class HealthCheckServlet extends HttpServlet {

    private static final long serialVersionUID = 1L;

    /**
     * Processes requests for both HTTP <code>GET</code> and <code>POST</code>
     * methods.
     *
     * @param request  servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException      if an I/O error occurs
     */
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        HealthCheckService healthCheckService = Globals.getDefaultBaseServiceLocator().getService(HealthCheckService.class);

        // If we couldn't find the HealthCheckService, throw an exception
        if (healthCheckService == null) {
            throw new ServletException("Could not find Health Check Service");
        }
        if (!healthCheckService.isEnabled()) {
            response.sendError(SC_FORBIDDEN, "MicroProfile Health Check Service is disabled");
            return;
        }

        healthCheckService.performHealthChecks(response, HealthCheckType.fromPath(request.getPathInfo()), request.getParameter("pretty"));
    }

    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /**
     * Handles the HTTP <code>GET</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /**
     * Handles the HTTP <code>POST</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /**
     * Returns a short description of the servlet.
     *
     * @return a String containing servlet description
     */
    @Override
    public String getServletInfo() {
        return "HealthCheck Endpoint";
    }// </editor-fold>

}
